Study of metal concentrations in the environment near diesel transport routes

Wang, Jingya; Chang, Shih-Hsien; Chen, Mei-Chun

doi:10.1016/j.atmosenv.2009.03.028

Cited by 31 publications

(40 citation statements)

References 23 publications

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“…In this study, in order to distinguish the portion affected by resuspension from that by other sources, for example, tailpipe emission (combustion products from fuel), the metal contents in aerosols have been plotted in comparison with those in road dust, instead of those in the upper continental crust (Figure 3). Data of metal contents in road dust were obtained from the study of Kuo et al 6 Most of the metals in outdoor air were close to the 1:1 straight line at the control site (Figure 3a), suggesting that resuspension was responsible for most of the metal abundance in outdoor air at that site. Compared with the metals at the control site, more metals in outdoor air showed significant enrichment at the exposure sites (Figure 3b).…”

Section: Resultsmentioning

confidence: 79%

“…Our previous study 6 indicated that the total number of vehicles per day was 7585; diesel vehicles accounted for B31.5% of the total number of vehicles. However, the total volume of exhaust produced by diesel vehicles per day (9.07 m 3 /day) was much higher than that for gasoline vehicles (5.26 m 3 /day), and accounted for B61.7% of the total traffic exhaust emissions.…”

Section: Resultsmentioning

confidence: 98%

“…9,21 Kuo et al 6 indicated that gasoline-and diesel-related metals accumulated in the road dust and resulted in higher levels of vehicle-related metals in road dust than in the upper continental crust, such as river dust. In this study, in order to distinguish the portion affected by resuspension from that by other sources, for example, tailpipe emission (combustion products from fuel), the metal contents in aerosols have been plotted in comparison with those in road dust, instead of those in the upper continental crust (Figure 3).…”

Section: Resultsmentioning

confidence: 99%

“…The metal loadings (mg/m 2 ) in household dust at the exposure sites were all higher than those at control site, but only Fe, Al, Pb, Zn, Cu, Ni and As showed significant (Po0.05) differences. The site-to-site variations of metal concentrations in aerosols have been reported in detail elsewhere, 6 whereas those in household dust at eight exposure sites are shown in Supplementary Table S1. Kuo et al 6 pointed out that traffic speed was the main factor that led to the site-to-site variations of metal concentrations in outdoor aerosols.…”

Section: Resultsmentioning

confidence: 99%

“…Our recent study indicated that diesel vehicles contributed significant amounts of metals to the outdoor environments along the diesel transport routes. 6 However, the effects of diesel vehicle emissions of metals on indoor environments have not been well reported. Lough et al 2 indicated that the elements emitted from diesel vehicle exhaust included both crustal and anthropogenic elements.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the vehicle contributions of metals to indoor environments

Wang

Liu

Lin

et al. 2012

J Expo Sci Environ Epidemiol

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A large number of diesel vehicles carrying gravel and sand shuttle back and forth every day on the major thoroughfares (Tai-16 and Tai-21) from Shinyi to Jiji in Nantou, Taiwan. A total of 10 stations along the major thoroughfares were selected as the exposure sites, whereas a small village located B9 km from a main traffic route was selected as the control site. Outdoor and indoor aerosol samples were collected using high-volume samplers and Harvard samplers, respectively. The metal concentrations of outdoor and indoor PM 10 at the exposure sites were, respectively, higher than those at the control site. The plots between metal contents in the aerosols and road dust showed that diesel vehicles contributed significant amounts of metals to the outdoor and indoor aerosols at the exposure sites. Household dust samples along the roadside within 30 m of the main road in the small towns were collected using the wipe method. Based on the results of principal component analysis (PCA), three major components for household dust were identified: resuspended from road dust, brake wear and diesel emissions. Enrichment factors were applied to assess the contribution of pollution sources to household dust. These factors were calculated with respect to unpolluted river dust samples (EF river ) and road dust (EF road ). The differences between EF river and EF road could be mainly attributed to the effects of resuspension by passing vehicles. Approximately 72%, 68%, 68%, 73% and 86% of the vehicle-related metals Pb, Zn, Cu, Ni and Mo content, respectively, in household dust were the result of the resuspension of road dust by passing vehicles. The data of daily intakes of five metals (i.e., Fe, Pb, Cu, Ni and Mo) from inhalation and ingestion pathways showed that the doses from the ingestion pathway were much higher than those from the inhalation pathway.

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Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of the vehicle contributions of metals to indoor environments

Wang

Liu

Lin

et al. 2012

J Expo Sci Environ Epidemiol

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Natural atmospheric deposition of molybdenum: a global model and implications for tropical forests

et al. 2020

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Molybdenum (Mo) is an essential trace metal that plays a central role in biological nitrogen fixation (BNF) as the cofactor in the conventional form of the nitrogenase enzyme. The low availability of Mo in soils often constrains BNF in many terrestrial ecosystems. Atmospheric sources may supply a critical source of exogenous Mo to regions with highly weathered soils likely low in Mo, particularly in tropical forests where BNF is thought to be high. Here, we present results of a global model of Mo deposition that considers the principal natural sources of atmospheric Mo-windborne mineral dust, sea-salt aerosols, and volcanic sources-which operate over geologic time. The largest source of mineral dust globally is from North Africa. We

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Polycyclic aromatic hydrocarbons in household dust near diesel transport routes

Chen

Cheng

Huang

et al. 2011

Environ Geochem Health

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A river-dredging project has been undertaken in Nantou, Taiwan. A large number of diesel vehicles carrying gravel and sand shuttle back and forth on the main roads. Ten stations along major thoroughfares were selected as the exposure sites for testing, while a small village located about 9 km from a main traffic route was selected as the control site. Levels of household dust loading at the exposure sites (60.3 mg/m(2)) were significantly higher than those at the control site (38.2 mg/m(2)). The loading (μg/m(2)) of t-PAHs (total polycyclic aromatic hydrocarbons) in the household dust at the exposure sites was significantly higher (P < 0.05) than was the case at the control site. The diagnostic ratios of PAHs showed that diesel emissions were the dominant source of PAHs at the exposure sites. The lack of a significant correlation between the concentrations of Fe and t-PAHs suggested that the t-PAHs in household dust might come from diverse sources. However, a significant correlation (P = 0.003) between the concentrations of Mo and t-PAHs implied that the most of the t-PAHs in the household dust might have resulted from diesel emissions. The lifetime cancer risks of BaP(eq) from household dust exposure were markedly higher than those resulting from inhalation exposure.

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Study of metal concentrations in the environment near diesel transport routes

Cited by 31 publications

References 23 publications

Evaluation of the vehicle contributions of metals to indoor environments

Evaluation of the vehicle contributions of metals to indoor environments

Natural atmospheric deposition of molybdenum: a global model and implications for tropical forests

Polycyclic aromatic hydrocarbons in household dust near diesel transport routes

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